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Filters are all about personal taste. What better way to signal individuality than to ‘roll your own’? Dating back to the earliest days, cinematographers have been stretching stockings and running fishing line across lenses or selectively smearing Vaseline on filters held in front of the lens, all to get that unique flare or diffusion effect. 


Now, thanks to the hardworking R&D team at Simmod Lens, it is far easier than ever to do this professionally with the new Synergy ring. In essence, this is the ultimate DIY filtration creation holder system to allow the cinematographer to combine filtration elements in their own way, with the individual parts coming together to form a solution - hence Synergy.


First, the Synergy clamp-on ring is designed to securely hold the filters on your lens.


Second is the Clear Glass DIY FX filter - a 100mm clear round glass filter to which you apply grease, hairspray, goo or anything else you care to smear over it.


Third is the DIY Flare FX holder ring, which can be used to hold craft wire, fishing line or similar. There are holes all around the perimeter of the ring through which your chosen line can be threaded through in any pattern you choose. When the wire is hit with a high-output light like a torch beam, it creates unique flare effects.


Fourth is the DIY Diffusion FX holder, a clever ring used to attach your chosen piece of material to diffuse the image, whether that be a sweet wrapper, mesh or net. Simply stretch the material over the holder ring and secure it with the supplied black elastic bands.



  • Synergy Ring
  • DIY Diffusion FX Ring
  • DIY Flare FX Ring
  • DIY Clear Glass FX Ring
  • Felt Case



    ***Please allow 3-5 business days for engraving***


    Do you have a custom design or logo you'd like on your caps? Send it to with your order number in the subject line.


    Special Instructions:

    • Requests to change lens information and data will not be accepted once an order is submitted for processing and engraving.

    • Please leave notes and instructions for EACH cap in the "Additional Info" Section. 

    • If you're sending us a custom design file, please let us know by selecting the corresponding options or simply indicate that in your instructions.

    • If you do not see your focal length or f.stop in the pull-down menu, DO NOT select the closest number.  Please leave the exact info in the "Additional Info"  Section

    • If you will be submitting a custom design file, please note that on the order.

    • For custom designs, please download this Illustrator TEMPLATE and export as a transparent (no background) PNG file.  Email the design file to with your order number in the subject line.


    Watch Mark Holtze's video to learn more about the SIMMODING process: VINTAGE LENSES FOR VIDEO


    Our Rear EF caps utilize a 1mm thick anodized aluminum top plate, allowing us to custom engrave to your specifications. Functional and stylish.


    Want a matching Engraved Front Cap? Check them out here!


    If you do not see a brand or focal length you are looking for, simply select OTHER and leave us a note.

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